I have the HARBETH 30.2XD’s …. But not in a “ unibox” electronics rig upstream
I stayed with amp and sources as standalones as improved audio performance options over the unibox options.
For me , it’s a REGA OSIRIS integrated amp, with a REGA ISIS Valve cdp/dac and a MOON 280D MIND2 dac/Streamer/network player as its high-end digital sources.You may need a phono-stage add-on if that’s your thing ,
My Take:
The OSIRIS bested all contenders and pretenders in MY system… highly recommended with the HARBETHs. (….. LFD was my second choice . ….)
FWIW: add in the ATC C1 Sub MK2 subwoofer with high level inputs from the beefy output OSIRIS…. an ideal pairing and EZ subwoofer integration with the HARBETHs as a sealed bottom-firing sub to flesh the bottom end below 50 Hz.
Reviews:
https://everydayaudiophile.com/2019/12/23/rega-osiris-a-dual-mono-champ/
https://audiofi.net/2012/08/rega-osiris-punching-heavy/
https://www.theabsolutesound.com/articles/rega-isis-cd-player-osiris-integrated-amplifier-tas-213/